English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Calculations for infinite nuclear matter with realistic nucleon-nucleoninteractions suggest that the isoscalar effective mass of a nucleon at thesaturation density, m*/m, equals 0.8 +/- 0.1. This result is at variance withempirical data on the level density in finite nuclei, which are consistent withm*/m ~ 1. Ma and Wambach suggested that these two contradicting results may bereconciled within a single theoretical framework by assuming a radial-dependenteffective mass, peaked at the nuclear surface. The aim of this exploratory workis to investigate this idea within the density functional theory by using aSkyrme-type local functional enriched with new terms, $\tau(\mathbf{\nabla}\rho)^2$ and $\tau\frac{d\rho}{dr}$, where $\tau$ and $\rho$denote the kinetic and particle densities, respectively. We show that each ofthese terms can give rise to a surface peak in the effective mass, but of alimited height. We investigate the influence of the radial profile of theeffective mass on the spin-orbit splittings and centroids. In particular, wedemonstrate that the $\tau \frac{d\rho}{dr}$ term quenches the 1f5/2-1f7/2splitting in 40Ca, which is strongly overestimated within conventional Skyrmeparametrizations.

Surface-peaked effective mass in the nuclear energy density functional and its influence on single-particle spectra